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Shading anti-counterfeiting technology

A technology of shading and technology, applied in the field of information processing, can solve problems such as image quality impact, and achieve the effects of improving anti-counterfeiting strength, increasing anti-counterfeiting strength, and increasing production costs

Inactive Publication Date: 2016-03-02
王萍
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AI Technical Summary

Problems solved by technology

[0005] The present invention proposes an anti-counterfeiting technology that combines anti-copying technology and coding technology. Its purpose is to improve the anti-counterfeiting strength and security of the anti-copying technology. At the same time, by improving the coding method, the gray value of the coding module and the gray value of the corresponding area of ​​​​the image One-to-one correspondence, solving the problem that the image quality is affected by the embedded encoding

Method used

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Experimental program
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Embodiment Construction

[0035] 1. First, binarize the background image with warning patterns. The binarized image can be regarded as two parts marked by white (0) and black (1). White (0) needs to be embedded information image, black(1) shading image;

[0036] 2. Use part of the image marked as white (0) as a warning image, and the rest of the image as shading.

[0037] 3. Select two gray color blocks G1, G2, the gray value of G1 is 125, and the gray value of G2 is 125.

[0038] 4. After performing FM screening on the color block G1, perform ∩ operation with the shading part of the image.

[0039] 5. The other color block G2 performs AM screening and warning image to perform ∩ operation.

[0040] 6. Embed the information "0111101010" in the warning pattern, use the above scheme (1) to embed the information, encode from left to right, the first digit is "0", and the dots are changed from one grid unit to Start from the bottom right, fill from right to left, from bottom to top, the second bit is "...

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Abstract

The invention provides a shading anti-counterfeiting technology. Through a copying machine, authenticity identification can be simply performed. Simultaneously, an image sensor can be used to read embedded figure coding information so as to realize an anti-counterfeiting function. In a coding mode which is different from screen coding, a specific size, a specific shape and a group of dot matrixes with a specific direction are not needed; based on a gray value of an image itself, pixel points are sequentially exposed so that a coding module group with a certain rule is formed and information embedding is realized.

Description

technical field [0001] The invention relates to a shading anti-counterfeiting technology in the field of information processing, including a method for hiding a warning pattern in the shading and a technology for embedding anti-counterfeiting information in the warning pattern. Background technique [0002] In order to prevent graphics from being copied and printed, people have thought of a variety of anti-copying technologies, mainly to hide some warning texts in the background of securities or documents in a specific way. After copying by ordinary copiers, these warning texts will be revealed. This technology is a low-cost and effective anti-counterfeiting method to identify authenticity, but this method cannot completely solve the problem of counterfeiting, and can only be used as an auxiliary anti-counterfeiting means. [0003] Screen coding anti-counterfeiting is a popular digital anti-counterfeiting method in recent years. By using the characteristics of the screen, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/405H04N1/52
Inventor 王萍
Owner 王萍
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